Evaluation of three Beauveria bassiana isolates on saw-toothed beetle Oryzaephilus surinamensis and the effect of different temperature on their germination and mycelium growth

LATIFIAN, M.; SOLEIMAN NEJADIAN, E.; GHAZAVI, M.; HAYATI, J.; MOSADEGH, S. M.; NIKBAKHT, P.

Evaluation of three Beauveria bassiana isolates on saw-toothed beetle Oryzaephilus surinamensis and the effect of different temperature on their germination and mycelium growth

Document Type : Pest Management

Authors

Abstract

Beauveria bassiana isone of the biocontrol agents of saw-toothed beetle Oryzaephilus surinamensis. For selection the best Iranian isolates of this fungus the effect of temperature and germination and radial growth and virulence of three isolates of this fungus were studied on larvae and adult stages. Results showed that there were significant differences in germination and radial growth at different temperatures. Minimum temperature for germination and radial growth was 5ºC and maximum of those was 35ºC. Optimum temperature for IRAN 441C and IRAN 403C activities was 25ºC and for IRAN 440C was 20ºC. Bioassay showed that the lowest LC₅₀ belong to IRAN 441C for adult and larvae were 2.51e4 and 2.31e3 respectively. The highest LC₅₀ belong to IRAN 440C for adult and larvae were 3.34e5 and 9.02e3 respectively. Results showed that isolate IRAN 441C had the best germination and radial growth at wide range of temperatures. It had also the higher mortality effect on adult and larvae stages, therefore it was suitable for application in date store in tropical and subtropical conditions

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